Description
The EbmlUnicodeString::UpdateFromUTF8 function in libEBML before 1.3.3 allows context-dependent attackers to obtain sensitive information from process heap memory via a crafted UTF-8 string, which triggers an invalid memory access.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libebml | 1.3.3-1 | — |
| Debian 13 | libebml | 1.3.3-1 | — |
| Debian 12 | libebml | 1.3.3-1 | — |
| Debian 8 | libebml | 1.3.0-2+deb8u1 | DSA-3538-1 |
| Debian 7 | libebml | 1.2.2-2+deb7u1 | DSA-3538-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | libebml | 0.7.7-3.1+deb6u1 | DLA-438-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | libebml | 1.3.0-2+deb8u1build0.14.04.1 | — |
Advisories 2
- DLA-438-1 libebml - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3538-1 libebml - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-3538 vendor-advisory
- 95124 vdb-entry
- openSUSE-SU-2016:0125 vendor-advisory
- https://github.com/Matroska-Org/libebml/commit/ababb64e0c792ad2a314245233db0833ba12036b
- http://www.talosintelligence.com/reports/TALOS-2016-0036/
- [matroska-users] 20151020 libEBML v1.3.3, libMatroska v1.4.4 released: important fixes mailing-list
- https://github.com/Matroska-Org/libebml/blob/release-1.3.3/ChangeLog
- 85307 vdb-entry